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Concrete

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Full-Text Articles in Engineering

Long-Term Performance Of Sustainable Pavements Using Ternary Blended Concrete With Recycled Aggregates, Seth M. Wagner Aug 2019

Long-Term Performance Of Sustainable Pavements Using Ternary Blended Concrete With Recycled Aggregates, Seth M. Wagner

Theses and Dissertations

The purposes of this study were to (a) design concrete pavement mixtures with recycled concrete aggregates using ternary blends of cementitious materials and a low water-to-binder ratio, (b) measure the fresh and hardened properties of the proposed concrete mixtures and (c) assess the long-term performance of the concrete implementing the use of recycled coarse aggregates. Preliminary investigation into ternary blend combinations via the compressive testing of mortar cubes and isothermal calorimetry was used to predict an optimal blend of cementitious material. Mixes using recycled concrete aggregates at varying replacement rates were tested for fresh and hardened properties using the proposed ...


Mitigating Carbon Dioxide Emissions In The Cement Industry Through Carbon Capture And Storage, Nicholas J. Cramer Jun 2019

Mitigating Carbon Dioxide Emissions In The Cement Industry Through Carbon Capture And Storage, Nicholas J. Cramer

Construction Management

The cement industry is responsible for 7% of industrial energy use, the third largest energy consumer in the world. The industry is also responsible for 7% of global carbon dioxide emissions, the second largest industrial emitter. With current trends continuing, global cement usage will rise with population and urbanization. The low-carbon transition of the cement industry requires innovative technologies and producer cooperation. Carbon capture and storage, known as CCS, is a safe and sustainable solution to significantly reduce the amount being released into the atmosphere. Through CCS, carbon dioxide reacts with natural alkaline minerals, such as fly ash, to create ...


Interim Field Guide For Construction And Testing Of Concrete Shear Wall With Added Frp Layer, Carlos Alberto Espitia Jun 2019

Interim Field Guide For Construction And Testing Of Concrete Shear Wall With Added Frp Layer, Carlos Alberto Espitia

Construction Management

In Los Angeles, many of the hospitals are no longer up to code as they were built in the 1970’s. The shear walls that the hospitals were constructed on stand to experience major failures in the event of a seismic event and this is the issue that this student research team was assigned with. This project was to design, procure, and construct all necessary constraints to be able to test a wall that is fundamentally similar to that of the sheer walls in these hospitals. Once this was complete the goal was to test two walls with an added ...


Advanced Concrete Course For Cal Poly Construction Management Department, Dante N. Feliciano Jun 2019

Advanced Concrete Course For Cal Poly Construction Management Department, Dante N. Feliciano

Construction Management

This senior project provides a solution to the Construction Management Department at Cal Poly, San Luis Obispo whose curriculum lacks an individual Concrete course. With Concrete being one of the most used building material worldwide, this course will help immensely. The goal of this project is to fill the gap with an Advanced Concrete Course that is prepared and ready to be introduced to future students. The course has an emphasis on outside research learning – where the student gets to become the instructor. Carefully thought out and executed lecture materials are included in the course. Lecture slides give background information ...


Habitat For Humanity Global Village: Means & Methods Of Construction In Trinidad & Tobago, Garrett Landress Jun 2019

Habitat For Humanity Global Village: Means & Methods Of Construction In Trinidad & Tobago, Garrett Landress

Construction Management

Habitat for Humanity Global Village is a sector of Habitat for Humanity that focuses on aiding in the construction of homes for those in need around the world. Habitat for Humanity Trinidad and Tobago has been part of Habitat for Humanity Global Village for many years and aids people in need on the Island of Trinidad in the Southern Caribbean. This paper will discuss the construction of a small home for a woman whose family was disowned by her father due to her reluctance to uphold traditional Indian values. Subsequently the family was living in poverty and currently residing in ...


Comparison Of Carbon Fiber And Fiberglass On Concrete Strength, Justin A. Baker Jun 2019

Comparison Of Carbon Fiber And Fiberglass On Concrete Strength, Justin A. Baker

Construction Management

The purpose of this paper is to compare two common polymers of the construction industry and determine if there are benefits of using them in concrete application to increase overall strength. The goal of the project is to complete a full experiment, utilizing concrete cylinders and beams to test the compressive and tensile properties of fiberglass and carbon fiber. This paper provides data from the experimentation of the compressive and tensile tests of carbon fiber and fiberglass to prove that these polymers are superior and aid in overall concrete strength. The experiment proved that carbon fiber is superior to fiberglass ...


The Influence Of Citric Acid On Setting Time And Temperature Behavior Of Calcium Sulfoaluminate-Belite Cement, Edgar Soriano May 2019

The Influence Of Citric Acid On Setting Time And Temperature Behavior Of Calcium Sulfoaluminate-Belite Cement, Edgar Soriano

Civil Engineering Undergraduate Honors Theses

Today the need to opt for alternative cementitious materials is growing due to environmental reasons and construction time frames that portland cement cannot always satisfy. Calcium Sulfoaluminate (CSA) cements are a strong candidate to supplement or replace portland cement in the construction field for certain applications. In the United States, CSA cement has been limited mostly to pavement repairs because of its rapid initial setting time. The chemical compound responsible for this phenomenon is the alumina. This compound and sulfate are present in larger proportions compared to portland cement. The purpose of this research is to study how the use ...


Mechanical And Durability Properties Of Concrete Under Low Temperatures, Yao Wang Jan 2019

Mechanical And Durability Properties Of Concrete Under Low Temperatures, Yao Wang

Civil Engineering Graduate Theses & Dissertations

Frost attack can heavily damage concrete materials and concrete structures. Therefore, it is important to predict the service life of concrete structures considering the effect of the deterioration process. A theoretical model based on Mori-Tanaka micromechanics method was developed to estimate the deterioration of elastic properties of concrete under low temperatures. The model took into account a continuous pore size distribution for cement paste, freezing temperatures with different pore sizes, and damage development in cement paste. The model was able to characterize the stiffening effect due to the formation of solid ice and the weakening effect of the damage development ...


Performance Of Concrete Tunnel Systems Subject To Fault Displacement, Michael Morano Jan 2019

Performance Of Concrete Tunnel Systems Subject To Fault Displacement, Michael Morano

Masters Theses

A Finite Element Analysis (FEA) investigation of concrete tunnel systems traversing seismic faults is carried out to determine how to effectively mitigate the stresses induced in the liner when subject to fault displacement. A parametric study of various fault parameters, both in the damage zone and competent rock, is carried out to determine the site conditions which induce the most stress on the tunnel liner system. Results indicate that friction angle, cohesion, and elastic modulus of fault zones have varying effects on the stresses induced on the liner. The width of damage zone and expected displacements are also investigated and ...


Precast Concrete Bridge Barriers For Accelerated Bridge Construction, Ashley A. Ecklund Jan 2019

Precast Concrete Bridge Barriers For Accelerated Bridge Construction, Ashley A. Ecklund

Graduate Theses and Dissertations

Many transportation organizations have embraced Accelerated Bridge Construction (ABC) to reduce both the traffic impacts and societal costs. One of the most common means to achieve ABC is to utilize prefabricated elements, which are connected together on-site to construct a bridge. ABC will not be effective if the barrier requires cast-in-place construction. The purpose of this report is to present details of a precast barrier and two connection alternatives between the deck and precast barriers. In addition, a new connection between two adjacent prefabricated barriers is presented.

One barrier to deck connection uses inclined reinforcing bars with threaded ends that ...


Incorporation Of Contaminated Sediment Into Environmentally Safe Concrete, Andrew Needs Jan 2019

Incorporation Of Contaminated Sediment Into Environmentally Safe Concrete, Andrew Needs

Williams Honors College, Honors Research Projects

The research performed through this project provided some interesting results on how the different properties of the contaminated sediment can impact the strength of the new concrete.

Average three, seven, and fourteen-day strengths increased when comparing to the baseline mix developed for the experiment. Increases in strengths were notices in the ten and twenty-five percent soil replacement mixes. The largest increase was approximately thirty-three percent greater than the baseline average.

The results from the forty percent replacement test showed a significant decrease in strengths when comparing against the baseline mix. A loss of about thirty percent was observed between the ...


Analysis Of Standardized Concrete Mixes, Riley Graybeal Jan 2019

Analysis Of Standardized Concrete Mixes, Riley Graybeal

Williams Honors College, Honors Research Projects

Concrete is one of the most common materials used in construction. It is mass produced throughout the country, with numerous different designs for concrete mixes. A common practice among concrete manufacturers is to use a standardized concrete mix design. These standardized mix designs are pre-tested and are not usually altered frequently. The hypothesis of this research project is that manufacturers do not constantly investigate new ways to save on their mixes, and simply use the same standardized mix designs.

In this research, investigations into what alterations may reduce the cost of standardized mixes began with a baseline mix design provided ...


Development Of Test Methods For Characterizing Extrudability Of Cement-Based Materials For Use In 3d Printing, Jonathan Thomas Kuchem Jan 2019

Development Of Test Methods For Characterizing Extrudability Of Cement-Based Materials For Use In 3d Printing, Jonathan Thomas Kuchem

Masters Theses

"3D printing is the process of creating three-dimensional objects using an automated additive manufacturing process. The 3D printing process has been used with materials such as metals and polymers, but application with cement based materials for the construction industry has yet to be developed. In this research, two main problems were investigated for printing cement based composite materials: extrudability and tensile reinforcement. Fiber-reinforced concrete (FRC) was studied as an internal reinforcing system to increase tensile/flexural strength. First, FRC was studied to investigate mechanical properties and use of fibers from waste tires as an environmentally friendly option. A reference mixture ...


Building A Handicap Accessible Entrance And Gabion Wall, David C. Marter Dec 2018

Building A Handicap Accessible Entrance And Gabion Wall, David C. Marter

Construction Management

As people age, their bodies naturally deteriorate and often times people are confined to wheelchairs in order to get around. Uneven and unstable ground is a large obstacle for people who live confined to a wheelchair. This project was derived and designed in order to help a family with multiple family members bound to wheelchairs to allow them an easier point of access into the home. The project itself consists of the construction of a concrete walkway and a gabion wall to provide some additional aesthetics. The concrete pathway ranges from the driveway to a paver pathway that curves around ...


Effect Of Cement Content On Concrete Performance, Caleb Joshua Lebow Dec 2018

Effect Of Cement Content On Concrete Performance, Caleb Joshua Lebow

Theses and Dissertations

Of all the traditional concrete materials, portland cement has the greatest impact on mixture cost and the environment. Cement is in many ways the glue holding concrete together (Weiss, 1999), and as such, it plays a major role in fresh and hardened concrete properties. Without the proper range of cement in the mixture, low strength development or excessive shrinkage may occur leading to premature deterioration. The Arkansas Department of Transportation (ARDOT) recognizes two types of concrete for use in bridge construction, Class S and Class S(AE). This paper focuses on the findings from testing of Class S(AE) concrete ...


On The Development Of 8,000 Psi Geopolymer Mortar For Practical Use In Field Applications, Remington Gabriel Reed Dec 2018

On The Development Of 8,000 Psi Geopolymer Mortar For Practical Use In Field Applications, Remington Gabriel Reed

Theses and Dissertations

Although there are several perceived benefits from the use of geopolymer binder as an alternative to ordinary portland cement in concrete materials, it is not widely used in field applications. Geopolymer materials have no set guidelines for mixture design and often require heat curing to facilitate strength gain. Additionally, many geopolymers are created using carefully controlled and high quality materials and activator chemicals. These factors greatly affect the practicality of the material. The goal of this research was to create a geopolymer material capable of achieving high compressive strengths at 28 days without heat curing, and using only readily available ...


Modeling And Simulation Of Damage In The Brazilian Indirect Tension Test Using The Finite-Discrete Element Method, Jeremiah C. Leyba Aug 2018

Modeling And Simulation Of Damage In The Brazilian Indirect Tension Test Using The Finite-Discrete Element Method, Jeremiah C. Leyba

Civil Engineering ETDs

The Brazilian indirect tension test is used to investigate possible correlations between progressive damage and associated permeability changes. The test offers ease of replicability with a damage behavior known to lead to fracture openings as a tool for interpreting the indirect tensile strength of concrete and rocks. This behavior can lend insight into the nature of tensile damage and fracture progression in association with changes in permeability. The nature of these brittle materials is known to exhibit rapid failures in the Brazilian indirect tension test and require a method to retard the progression of damage for the possibility of acquiring ...


Environmental And Reinforcement Effects On Concrete Expansion Undergoing Accelerated Alkali-Silica Reaction, David Graff Jun 2018

Environmental And Reinforcement Effects On Concrete Expansion Undergoing Accelerated Alkali-Silica Reaction, David Graff

Civil Engineering Graduate Theses & Dissertations

This thesis is a part of ongoing research investigating the effects of alkali-silica reactions (ASR) on concrete’s mechanical properties. Over 50 concrete specimens have been cast and cured to encourage ASR development to the point of damage in less than a year. Specimens include 42”×30”×10” shear specimens, 14”×14”×14” blocks, 6”×6”×14” prisms, 4”×4”×16” prisms, cylinders, and wedge splitting test specimens. Some samples are stored in a fog room with conditions of 100oF, and 95% relative humidity and wrapped in burlap wetted or submerged in 1.0M sodium hydroxide (NaOH). Other specimens are ...


Alternate Reinforcement For Structural Concrete, Barrett Lowe May 2018

Alternate Reinforcement For Structural Concrete, Barrett Lowe

Construction Management

Concrete has been utilized on construction projects for thousands of years, ranging from the Pyramids to the foundation your home is built on. Innovated upon, concrete and its properties have changed over the years, one of the greatest being the discovery of tensile reinforcement. Rebar, commonly known as reinforcing steel or reinforcement bars, have been used in the construction industry for decades. Ranging in size and application, rebar’s unmatched tensile strength and anti-corrosive properties make it the champion of reinforcing structural concrete. Though the advancement in technology has created a new era where other materials may take its place ...


The Production Of Pyrolytic Biochar For Addition In Value-Added Composite Material, Douglas Matthew Cuthbertson Jan 2018

The Production Of Pyrolytic Biochar For Addition In Value-Added Composite Material, Douglas Matthew Cuthbertson

Electronic Thesis and Dissertation Repository

Pyrolytic biochar has recently gained attention for its potential value as a carbon sequestering by-product that can be used in industrial applications. While biochar is typically targeted for soil amendment applications, higher value applications such as addition in consumer products and building materials needs to be investigated.

In this study, biochar is produced from three different Canadian feedstocks using three different pyrolysis methods. The biochar is characterized to determine the effects that feedstock selection and pyrolysis conditions has on biochar properties. The biochar is also incorporated into concrete at varying concentrations to create a lightweight and sustainable material. The effect ...


Deterioration Of Multi-Functional Cementitious Materials In Nuclear Power Plants, Yuxiang Jing Jan 2018

Deterioration Of Multi-Functional Cementitious Materials In Nuclear Power Plants, Yuxiang Jing

Civil Engineering Graduate Theses & Dissertations

To ensure safe operation of nuclear power plants (NPPs) during their service life and enhance the performance of spent nuclear fuel (SNF) storage systems, comprehensive investigation on the behavior of concrete and their components under the long-term nuclear radiation is needed. A theoretical model was developed first to predict the deterioration of concrete under neutron radiation, taking into account both of the effects of neutron radiation and the radiation-induced heating on the mechanical property and volume change of concrete. It was shown that the volume change of concrete is dominated by the expanding characteristic of aggregates. Since neutron radiation can ...


Performance Of Common Treatments For Reinforced Concrete Highway Bridge Decks, Jeffrey David Kvamme Jan 2018

Performance Of Common Treatments For Reinforced Concrete Highway Bridge Decks, Jeffrey David Kvamme

Civil Engineering Graduate Theses & Dissertations

This study gathers information on more than 15,000 bridges to examine time domain trends in condition of bridge decks in service that employ several common treatments. This study computes average improvement to deck condition due to these treatments and computes the mean intervals of changes in general condition ratings related to the deck’s post-treatment condition and its approximate pre-treatment condition. In addition, this study performs a cost analysis to compare the average unit cost and the cost effectiveness of each treatment. The results show an average improvement to deck condition of 1.31 rating values due to treatment ...


Antimicrobial Aggregates For The In-Situ Control Of Microbially Induced Concrete Corrosion, Alejandro Caicedo-Ramirez Jan 2018

Antimicrobial Aggregates For The In-Situ Control Of Microbially Induced Concrete Corrosion, Alejandro Caicedo-Ramirez

Civil Engineering Graduate Theses & Dissertations

Concrete is the most common material used to transport storm water and sewage in the world. It is used for pipes, culverts, tunnels and variety of other subterranean appurtenances. Municipalities, water utilities, and many agencies recognize that concrete corrosion is emerging as one of the most serious problems plaguing this critical infrastructure. The dominant form of concrete deterioration in wastewater conveyance systems is microbially mediated (Microbial Induced Concrete Corrosion: MICC). This type of corrosion occurs as a result of ubiquitous microbiological sulfur cycling within sewers: Below the waterline, sulfate present in wastewater is reduced to sulfide (H2S) under ...


Investigating Early Age Behavior Of Portland Cement Concrete In Arid Regions, Evan Wolf Jan 2018

Investigating Early Age Behavior Of Portland Cement Concrete In Arid Regions, Evan Wolf

Open Access Theses & Dissertations

The early-age behavior and properties of portland cement concrete change rapidly over time as a result of the hydration process. Comprised of a series of chemical reactions, this process accelerates nonlinearly with the curing temperature. Gaining knowledge and understanding of the phases of the hydration process (i.e., dormant, setting, and hardening) plays an important role in the timely opening of roads, resuming of construction, and achieving long-term performance. Standard tests such as ASTM C403 arbitrarily define the time of initial and final setting of concrete. Despite decades of studies concerning setting times, actual predictions still span hours, while the ...


Nano-Engineered Heated Pavements, Ali Arabzadeh Jan 2018

Nano-Engineered Heated Pavements, Ali Arabzadeh

Graduate Theses and Dissertations

Millions of dollars are spent annually for removing ice and snow from paved surfaces using conventional techniques such as deployment of snow plowing equipment and use of deicing chemicals that are neither economical nor environmentally friendly. Alternative approaches such as producing superhydrophobic (super water-repellent) pavement surfaces and implementing electrically-conductive heated pavement systems, or even merging these two technologies to produce hybrid heated pavement systems, can alleviate many of the problems associated with conventional ice and snow removal techniques.

In this study, superhydrophobic concretes – including hot mix asphalt (HMA) and portland cement concrete (PCC) – and electrically-conductive asphalt matrices, including electrically conductive ...


Coupling Radio Frequency Energy Via The Embedded Rebar Cage In A Reinforced Concrete Structure For The Purpose Of Concrete Degradation Sensing, Ryan Campiz Jan 2018

Coupling Radio Frequency Energy Via The Embedded Rebar Cage In A Reinforced Concrete Structure For The Purpose Of Concrete Degradation Sensing, Ryan Campiz

UNF Graduate Theses and Dissertations

This study focuses on utilizing an energy harvesting system in which a dedicated Radio Frequency (RF) power source transmits RF power via rebar in a reinforced concrete column. The RF power is received and decoupled by a receiver, and is then rectified, boosted, and stored as electrical energy in a supercapacitor, later to be used to make measurements, process data, and communicate to the source via rebar. Two design attempts are presented in this study: (a) one uses single line conduction at 2.4 GHz for RF power transfer; (b) the other uses a more conventional two-line conduction at 8 ...


Nondestructive Evaluation Of Corrosion Damage In Reinforced Concrete Aged Slab Specimen, Rawya Abdulsattar Abduljabbar Jan 2018

Nondestructive Evaluation Of Corrosion Damage In Reinforced Concrete Aged Slab Specimen, Rawya Abdulsattar Abduljabbar

Theses and Dissertations

The deterioration of concrete bridge decks presents a maintenance challenge for most transportation agencies and bridge owners. This problem increases during the freeze-thaw cycle. De-icing salts can accelerate the deterioration process. Corrosion of steel reinforcement in reinforced concrete structures is considered a dominant factor causing premature deterioration, especially those structures located in a coastal environment. The resulting corrosion product produced has several times the volume of steel, resulting in cracking of the concrete cover if the corrosion is significant. In this study, a bridge deck specimen was subjected to an artificial environment to accelerate the corrosion process. Prior to this ...


Testing And Modeling Of The Thixotropic Behavior Of Cementitious Materials., Bashir Hasanzadeh Dec 2017

Testing And Modeling Of The Thixotropic Behavior Of Cementitious Materials., Bashir Hasanzadeh

Electronic Theses and Dissertations

During construction, concrete goes under various operations. It is normally transported to the job site, be placed and consolidated in the formwork, etc. The easiness and quality of these operations are very much related to the intrinsic rheological properties of concrete. Therefore, a good understanding of rheological behavior of concrete under various conditions are needed. Thixotropy is an important part of rheology. The thixotropic behaviors of concrete can be good representatives of its flow behaviors on the job site. For example, the breakdown aspect of thixotropy can help to explain how its flow behavior can impact concrete pumping and its ...


Experimental And Simplified Analytical Investigation Of Full Scale Sandwich Panel Walls, Salam Adil Al-Rubaye Dec 2017

Experimental And Simplified Analytical Investigation Of Full Scale Sandwich Panel Walls, Salam Adil Al-Rubaye

All Graduate Theses and Dissertations

Concrete sandwich wall panels have been used for decades in the precast concrete construction industry because of their thermal efficiency. To achieve full or partial-composite action in concrete sandwich panel walls, the engineer must obtain a percent composite action from a connector manufacturer, making some engineers uncomfortable. Engineers are dependent upon the recommendations given by the connector manufacturers to establish their designs. This project tested six full scale sandwich panel walls to evaluate the percent composite action of various connectors and compare the results to those provided by the composite connector manufacturers.

This project aimed to validate current procedures using ...


Investigation Of Concrete Electrical Resistivity As A Performance Based Test, Amir Malakooti Dec 2017

Investigation Of Concrete Electrical Resistivity As A Performance Based Test, Amir Malakooti

All Graduate Theses and Dissertations

The purpose of this research project was to identify the extent that concrete resistivity measurements (bulk and/or surface) can be used as a performance based lab test to improve the quality of concrete in Utah bridge decks. By allowing UDOT to specify a required resistivity, concrete bridge deck quality will increase and future maintenance costs will decrease.

This research consisted of two phases: the field phase and the lab phase. In the field phase, concrete samples were gathered from local concrete producers in Utah. These concrete samples were made with common concrete mixes used in bridge decks across the ...